
/*
 * Copyright (c) 2011
 * Telecooperation Office (TecO), Universitaet Karlsruhe (TH), Germany.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer in the documentation and/or other materials provided
 *    with the distribution.
 * 3. Neither the name of the Universitaet Karlsruhe (TH) nor the names
 *    of its contributors may be used to endorse or promote products
 *    derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Author(s): Philipp Scholl <scholl@teco.edu>
 */
#include <stdint.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>

void panic(char *buf);//  __attribute__((noreturn));

# define SR_REGISTER  17 /* supervision register           */
# define EPC_REGISTER 32 /* exception program counter      */
# define EEA_REGISTER 48 /* exception effective address    */
# define ESR_REGISTER 64 /* exception supervision register */
# define DSX_BIT (1<<13) /* instruction in delay slot      */

static uint32_t
mfspr(uint32_t reg)
{
  uint32_t val;
  asm ("b.mfspr %0, %1, 0;" :"=r"(val) : "r"(reg) );
  return val;
}

static void
mtspr(uint32_t reg, uint32_t val)
{
  asm volatile ("b.mtspr %0, %1, 0;" :: "r"(reg), "r"(val) );
}


